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Numerical Analysis of Combined Helical Pile Raft Foundation (CHPRF) Under Compressive and Tensile Loadings

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Abstract

This study examines the combined helical pile raft foundation (CHPRF) performance under compressive and tensile (uplift) loadings using different configurations. The CHPRF is expected to satisfy better the settlement and the tensile capacity criteria than conventional combined pile raft foundations (CPRF). The analysis is performed in a homogenous cohesionless soil medium using the finite element (FE) analysis. The effect of various parameters, such as the diameter and the number of helix plates in a pile and the spacing between the piles, on the performance of the CHPRF is investigated. With the aid of load–displacement curves, the ultimate settlement of the CHPRF is found under compressive loadings, whereas the ultimate tensile capacity is calculated under tensile loadings. In the FE modelling, the concrete raft and steel piles are modelled with plate elements and embedded beams, respectively. The soil is assumed to follow the Mohr–Coulomb failure criterion. As per the analysis, the CHPRF exhibits less ultimate settlement and more tensile capacity compared to the conventional CPRF. The effect of the number of helices on final settlement and tensile capacity is minimal compared to the helix diameter and the spacing between the piles.

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Data Availability

Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.

Abbreviations

B :

Width of raft foundation

D :

Diameter of helix

E s, E p, E c :

Modulus of elasticity of soil, pile and concrete, respectively

H :

Number of helix plates in a helical pile

L :

Length of helical pile

S :

Spacing between helical piles

V :

Volume

c :

Cohesion of soil

d :

Shaft diameter of helical pile

u X, u Y, u Z :

Displacement along X, Y and Z directions, respectively

\(\phi\) :

Angle of internal friction of soil

γ s, γ p, γ c :

Unit weight of soil, pile, and concrete, respectively

µ s, µ p, µ c :

Poisson’s ratio of soil, pile, and concrete, respectively

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Authors and Affiliations

  1. Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India

    Priyanka Ghosh & Sarvesh Garg

  2. Faculty of Technology, Uttar Banga Krishi Viswavidyalaya, Cooch Behar, 736165, India

    Subinay Saha Roy

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  1. Priyanka Ghosh
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  2. Sarvesh Garg
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  3. Subinay Saha Roy
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Correspondence to Priyanka Ghosh.

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Ghosh, P., Garg, S. & Saha Roy, S. Numerical Analysis of Combined Helical Pile Raft Foundation (CHPRF) Under Compressive and Tensile Loadings. Indian Geotech J (2024). https://doi.org/10.1007/s40098-024-00916-7

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